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: http://www.stsci.edu/hst/cos/design/hst/cos/documents/handbooks/current/ch09.Scheduling3.html
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| COS Instrument Handbook for Cycle 24 |
| help@stsci.edu |
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The first time that you acquire an object, you must include a 6-minute overhead for the HST guide-star acquisition. In all subsequent orbits of the same visit, you must include the 4-minute overhead for the guide-star reacquisition. If you are observing an object in the Continuous Viewing Zone (CVZ), then no guide-star re-aquisitions are required.You must allocate additional time for each deliberate movement of the telescope; e.g., if you are performing a target-acquisition exposure on a nearby object and then offsetting to your target, or if you are taking a series of exposures in which you move the target on the detector (POS-TARG), then you must allow time for telescope motion. The time varies depending on size of the slew; see Table 9.2.Table 9.2: Generic Observatory Overhead Times
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